Other Commercial Matters (Details) - Business Acquisition, Acquiree [Domain] - Contingent Consideration Type [Domain] $ in Millions				6 Months Ended	9 Months Ended
	Apr. 21, 2015 USD ($)	Oct. 25, 2013 USD ($)	Jan. 01, 2004	Jun. 30, 2015 USD ($)	Sep. 30, 2013 USD ($)	Apr. 23, 2015	Sep. 01, 2011 USD ($)
Plains Gas Solutions, LLC v. Tennessee Gas Pipeline Company, L.L.C. et al [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value					$ 100.0
Brinckerhoff v. El Paso Pipeline GP Company, LLC., et al. [Member]
Loss Contingencies [Line Items]
Payments to Acquire Businesses, Gross	$ 1,130.0
Brinckerhoff v. El Paso Pipeline GP Company, LLC., et al. [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 171.0
Elba Liquefaction [Member] | Brinckerhoff v. El Paso Pipeline GP Company, LLC., et al. [Member]
Loss Contingencies [Line Items]
Business Acquisition, Additional Percentage of Interest Acquired	49.00%
SNG [Member] | Brinckerhoff v. El Paso Pipeline GP Company, LLC., et al. [Member]
Loss Contingencies [Line Items]
Business Acquisition, Additional Percentage of Interest Acquired	15.00%
Merger Transactions [Member] | Kinder Morgan Energy Partners, L.P. and El Paso Pipeline Partners, L.P. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number				5
Union Pacific Railroad Company v. Santa Fe Pacific Pipelines, Inc., SFPP, L.P., Kinder Morgan Operating L.P. “D”, Kinder Morgan G.P., Inc., et al. [Member] | SFPP L.P. [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract		10 years	10 years
Loss Contingency, Damages Sought, Value		$ 22.3
Union Pacific Railroad Company v. Santa Fe Pacific Pipelines, Inc., SFPP, L.P., Kinder Morgan Operating L.P. “D”, Kinder Morgan G.P., Inc., et al. [Member] | SFPP L.P. [Member] | Pending Litigation [Member] | landowners [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number						14
Union Pacific Railroad Company v. Santa Fe Pacific Pipelines, Inc., SFPP, L.P., Kinder Morgan Operating L.P. “D”, Kinder Morgan G.P., Inc., et al. [Member] | SFPP L.P. [Member] | Loss on Long-term Purchase Commitment [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Initial Award Amount, Annual Rent Payable							$ 14.0
Price Reporting Litigation [Member] | Kinder Morgan Bulk Terminals, Inc. [Member] | Price Reporting Litigation [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value				$ 140.0
2008 rate case and the 2010 rate case [Member] | EPNG [Member] | Unfavorable Regulatory Action [Member] | Opinion 517 issued and implemented (rehearing pending); and Opinion 528 issued and is awaiting filing of court document) [Member] | Regulated Operation [Member] | Various Shippers [Member] | Federal Energy Regulatory Commission [Member]
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number				2